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We present a single-beam atomic magnetometer operating at room temperaturefor the measurement of ac magnetic fields. The magnetometer functions in thenon-linear regime of magneto-optical rotation of $^{85}$Rb atomic vapour. Wedemonstrate a sensitivity of $\sim 0.9$ pT$/ \sqrt{Hz}$ at 2 kHz and a largebandwidth of 24 kHz. The dynamic range of measurement is $10^6$, making thesensor effective even in Earth's field. We present the signal-to-noise andbandwidth characteristics of the system for both shielded and unshielded modesof operation. Moreover, we perform theoretical analysis for the atom-lightsystem for the single laser beam configuration. The effect of light intensityand detuning on the magnetometer are studied theoretically as well asexperimentally to understand the strengths and limitations of the technique.

Single-beam room-temperature atomic magnetometer with large bandwidth and dynamic range